Inhibitors of the 5-lipoxygenase pathway activate pannexin1 channels in macrophages via the thromboxane receptor

Hercules A. da Silva-Souza, Maria Nathália de Lira, Naman K. Patel, David C. Spray, Pedro Muanis Persechini, Eliana Scemes

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A multitude of environmental signaling molecules influence monocyte and macrophage innate and adaptive immune responses, including ATP and prostanoids. Interestingly, purinergic (P2) and eicosanoid receptor signaling interact such that the activation of P2 receptors leads to prostanoid production, which can then interfere with P2Y-mediated macrophage migration. Recent studies suggest that blockade of 5-lipoxygenase (5-LOX) in macrophages can activate a permeation pathway involved in the influx of dye and the release of ATP. Here, we provide evidence that pannexin1 (Panx1) is a component of this pathway and present the intracellular signaling molecules linking the thromboxane (TP) receptor to Panx1-mediated dye influx and ATP release. Using pharmacological tools and transgenic mice deficient in Panx1, we show that two 5-LOX pathway inhibitors induce ATP release and influx of dye in a Panx1-dependent manner. Electrophysiological recordings performed in wild-type and Panx1-deficient macrophages confirmed that these 5-LOX pathway inhibitors activate currents characteristic of Panx1 channels. We found that the mechanism by which Panx1 channels are activated under this condition involves activation of the TP receptor that is mediated by the cAMP/PKA pathway. This is to our knowledge the first evidence for the involvement of Panx1 in the TP receptor signaling pathway. Future studies aimed to clarify the contribution of this TP-Panx1 signaling network to macrophage immune responses are likely to be important for targeting inflammatory and autoimmune diseases.

Original languageEnglish (US)
Pages (from-to)C571-C579
JournalAmerican Journal of Physiology - Cell Physiology
Volume307
Issue number6
DOIs
StatePublished - Sep 15 2014

Fingerprint

Thromboxane Receptors
Lipoxygenase Inhibitors
Macrophages
Adenosine Triphosphate
Coloring Agents
Eicosanoid Receptors
Prostaglandins
Purinergic P2 Receptors
Arachidonate 5-Lipoxygenase
Adaptive Immunity
Innate Immunity
Transgenic Mice
Autoimmune Diseases
Monocytes
Pharmacology

Keywords

  • ATP release
  • Dye uptake
  • Macrophages
  • Pannexin
  • Prostanoids

ASJC Scopus subject areas

  • Cell Biology
  • Physiology
  • Medicine(all)

Cite this

Inhibitors of the 5-lipoxygenase pathway activate pannexin1 channels in macrophages via the thromboxane receptor. / da Silva-Souza, Hercules A.; de Lira, Maria Nathália; Patel, Naman K.; Spray, David C.; Persechini, Pedro Muanis; Scemes, Eliana.

In: American Journal of Physiology - Cell Physiology, Vol. 307, No. 6, 15.09.2014, p. C571-C579.

Research output: Contribution to journalArticle

da Silva-Souza, Hercules A. ; de Lira, Maria Nathália ; Patel, Naman K. ; Spray, David C. ; Persechini, Pedro Muanis ; Scemes, Eliana. / Inhibitors of the 5-lipoxygenase pathway activate pannexin1 channels in macrophages via the thromboxane receptor. In: American Journal of Physiology - Cell Physiology. 2014 ; Vol. 307, No. 6. pp. C571-C579.
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